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Mathematical Problems in Engineering
Volume 2012 (2012), Article ID 567812, 14 pages
http://dx.doi.org/10.1155/2012/567812
Research Article

Experimental Study on Forecasting Mathematical Model of Drying Shrinkage of Recycled Aggregate Concrete

College of Civil Engineering, Chongqing Three Gorges University, 780 ShaLong Road, Wanzhou District, Chongqing 414000, China

Received 19 November 2011; Accepted 16 January 2012

Academic Editor: Ireneusz Zbicinski

Copyright © 2012 Yuanchen Guo and Xue Wang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

On the basis of basic law in AASHTO2007 model, the forecasting mathematical model of drying shrinkage of recycled aggregate concrete (RAC) is established by regression analysis and experimental study. The research results show that (1) with the replacement rate of RCA increases, the drying shrinkage value of RAC increases; this trend is even more obvious in the early drying time. (2) The addition of fly ash can inhibit the drying shrinkage of RAC, but the effect is not very obvious. Specifically, the addition of fly ash will increase the shrinkage to some extent when the mixing amount is 20%. (3) The addition of expansive agent can obviously inhibit the shrinkage of RAC; the inhibition affection is better than that of fly ash. (4) The forecasting mathematical models of drying shrinkage of RAC established in this paper have high accuracy and rationality according to experiment validation and error analysis.